package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import pojo.User;
public class LoginFilter implements Filter {

    public LoginFilter() {
    	
    }

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;  
		     HttpServletResponse resp = (HttpServletResponse)response;  
		      request.setCharacterEncoding("UTF-8");  
		      response.setContentType("text/html;charset=UTF-8");  
		       HttpSession session = req.getSession();  
		       User user = (User)session.getAttribute("user");  
		       if(user != null){  
		           chain.doFilter(request,response);  
		       } else{  
		         req.getRequestDispatcher("login.jsp").forward(request,response);  
		       }  
		    }  

	public void init(FilterConfig fConfig) throws ServletException {
	}

}
